Hyamass Cobalt Steel Step Drill Bit, M35 Grade 5% Cobalt HSS-Co,11 Size from 3mm to 13mm, Double Spiral Flutes and 1/4 Inch Hex Shank,Unibit Step Bit for Hole Drilling in Stainless Steel,Metal,Copper

【HIGH-QUALITY MATERIAL】Using M35 grade 5% cobalt HSS-Co material, The addition of cobalt increases heat resistance.its ability to resist wear over conventional high speed steels, allowing for shorter cycle times in production environments due to higher cutting speeds or from the increase in time between tool changes. M35 is similar to M2, but with 5% cobalt added. 【11 STEPS】 The step bit comes with 11 sizes ranging from 3mm to 13mm, The size marks are stamped next to each step to ease the use, you can drill up to 11 holes of different diameters with one bit, saving you time and efforts to change bits. 【Widely Use】Applicable machines: pistol drill, bench drill. Suitable for drilling new holes or and enlarging existing holes on workpieces with higher hardness, such as stainless steel, carbon steel, aluminum, iron, brass, copper, etc. 【Precise Design】Double spiral flutes for more efficient swarf clearance; 1/4 Inch hex Shank with quick release slot to eliminate slipping; Self-starting for clean holes in thin materials; M35 cobalt HSS to cut stainless steel. 【1/4 inch HEX SHANK 】Compared to bits with round shanks, this 1/4 inch hex-shank step bit can be gripped more tightly by compatible drills and screwdrivers for greater torque.